Lexmark W840 User Manual

Solving print quality problems
101
Troubleshooting
Entire page is white.  Make sure the packaging material is removed from the photoconductor kit.
 Check the photoconductor kit to be sure it is installed correctly.
 Replace the photoconductor kit.
Streaks appear on the page.  If you are using preprinted forms, make sure the ink can withstand temperatures of 
230°C (446°F).
 Replace the photoconductor kit or toner cartridge.
Printing is too dark.  Change the Toner Darkness setting in the Quality...

Solving print quality problems
102
Troubleshooting
Part or all of the page is 
printed in black.Check the photoconductor kit to see if it is installed correctly. 
The job prints, but the top and 
side margins are incorrect.  Make sure the Paper Size setting in the Paper menu is correct.
 Make sure the margins are set correctly in your software application.
Ghost images appear.  Make sure the Paper Type setting in the Paper menu is correct.
 Replace the photoconductor kit.
Gray background prints. ...

Solving print quality problems
103
Troubleshooting
The Quality menu operator panel options can be adjusted to help improve print quality.
In addition, the Enhance Fine Lines and Gray Correction options can be enabled to improve print quality. These settings are 
available on the driver and on the printer Embedded Web Server (EWS) interface. For more information about these 
options, see the driver help. 
Menu selectionPurposeVal u e s
Print Resolution To select printed output resolution 600 dpi
1200 dpi...

Administrative support
104
10Administrative support
Adjusting operator panel brightness and contrast
The LCD operator panel contrast and brightness can be adjusted through the Utilities menu. For more information, see the 
Menus and Messages Guide.
The LCD Brightness and LCD Contrast settings are adjusted separately. To change the LCD Brightness or LCD Contrast 
settings:
1Make sure your printer is on.
2Press   on the operator panel.
3Press  until  Settings appears, and then press  .
4Press  until...

Enabling operator panel menus
105
Administrative support
Enabling operator panel menus
1Turn the printer off.
2Press and hold   and   while turning the printer on.
3Release both buttons when Performing Self Test appears on the display.
The printer performs its power-on sequence, and then Config Menu appears on the first line of the display.
4Press  until  Panel Menus appears, and then press  .
5Press  until  Enable appears, and then press  .
The following messages appear briefly in succession: Submitting...

Adjusting Power Saver
106
Administrative support
Adjusting Power Saver
To  a d j u s t  t h e Power Saver setting:
1Make sure the printer is on and Ready appears on the display.
2Press   on the operator panel.
3Press  until  Settings appears, and then press  .
4Press  until  Setup Menu appears, and then press  .
5Press  until  Power Saver appears, and then press  .
6Using the numeric pad or the right and left arrows on the operator panel, enter the number of minutes for the 
printer to wait before...

Encrypting the disk
107
Administrative support
Encrypting the disk
Warning:All resources on the hard disk will be deleted. (Resources residing in flash memory or in RAM remain 
unaffected.)
Note:This setting is only available when a hard disk is installed.
1Turn the printer off.
2Press and hold   and   while turning the printer on.
3Release both buttons when Performing Self Test appears on the display.
The printer performs its power-on sequence, and then Config Menu appears on the first line of the...

Setting security using the Embedded Web Server (EWS)
108
Administrative support
Setting security using the Embedded Web Server (EWS)
You can enhance the security of network communications and device configuration by using the advanced security options. 
These features are available through the Web page of the device.
Setting the system password
Setting the system password protects configuration of the Embedded Web Server. A system password is also required for 
Secure mode and confidential communication...

Setting security using the Embedded Web Server (EWS)
109
Administrative support
Supporting IPSec (Internet Protocol Security)
IP Security protocol provides authentication and encryption of communications at the network layer allowing all application 
and network communications over the IP protocol to be secure. IPSec can be set up between the printer and up to five 
hosts, using both IPv4 and IPv6. To configure IPSec through the Embedded Web Server: 
1Open your Web browser. In the address line, enter the...

Setting security using the Embedded Web Server (EWS)
110
Administrative support
Using 802.1x Authenticating
802.1x port authentication allows the printer to join networks that require authentication before allowing access. 802.1x port 
authentication can be used with the WPA (Wi-Fi Protected Access) feature of an optional internal wireless print server to 
provide WPA-Enterprise security support.
Support for 802.1x requires the establishment of credentials for the printer. The printer must be known to...